Same soy sauce both times, probably same amount of sauce each time. He only had half a roll of sushi dipped in soy sauce and whammo! Soy sauce the only common ingredient. He's always had edamame cooked in the pod but has never dipped it in soy sauce until this night. That's the only soy he's ever had and he's had it at least once a week for a long time. I'm not sure what you mean "What were the other ingredients in the imitation crab?". Do you mean the sushi roll? I can't tell you what was in the crab I have no idea. I may have to go to the store to find out. The soy sauce is water, soybeans, salt and organic wheat. We're waiting to hear back on a allergist referral now.